Brigadier Command Support (#8235)

Adds the ability for plugins to register their own brigadier commands 

---------

Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>
Co-authored-by: Jason Penilla <11360596+jpenilla@users.noreply.github.com>
Co-authored-by: Bjarne Koll <git@lynxplay.dev>

test-plugin/src/main/java/io/papermc/testplugin/TestPluginBootstrap.java

@@ -8,6 +8,7 @@ public class TestPluginBootstrap implements PluginBootstrap {
 
     @Override
     public void bootstrap(@NotNull BootstrapContext context) {
+        // io.papermc.testplugin.brigtests.Registration.registerViaBootstrap(context);
     }
 
 }